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rego.go
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rego.go
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// Copyright The Enterprise Contract Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package rego
import (
_ "embed"
"fmt"
"os"
"path/filepath"
"sort"
"strings"
"text/template"
"github.com/open-policy-agent/opa/ast"
_ "github.com/enterprise-contract/ec-cli/internal/rego"
)
//go:embed rego.template
var regoTemplateText string
//go:embed nav.template
var regoNavTemplateText string
//go:embed builtins.template
var regoBuiltinsTemplateText string
var regoTemplate *template.Template
var regoNavTemplate *template.Template
var regoBuiltinsTemplate *template.Template
var builtins []*ast.Builtin
func init() {
funcs := template.FuncMap{
"replaceAll": strings.ReplaceAll,
"hasPrefix": strings.HasPrefix,
"params": func(params ...any) []any {
return params
},
"lvl": func(l int) string {
return strings.Repeat("*", l)
},
"inc": func(l int) int {
return l + 1
},
"seq": func(max int) []int {
if max == 0 {
return []int{}
}
s := make([]int, max)
for i := range s {
s[i] = i
}
return s
},
}
regoTemplate = template.Must(template.New("rego").Funcs(funcs).Parse(regoTemplateText))
regoNavTemplate = template.Must(template.New("rego-nav").Funcs(funcs).Parse(regoNavTemplateText))
regoBuiltinsTemplate = template.Must(template.New("rego-builtins").Funcs(funcs).Parse(regoBuiltinsTemplateText))
builtins = findBuiltins()
}
func GenerateRegoReference(module string) error {
if err := generateRegoReference(module); err != nil {
return err
}
if err := generateRegoReferenceNav(module); err != nil {
return err
}
if err := generateRegoBuiltins(module); err != nil {
return err
}
return nil
}
func findBuiltins() []*ast.Builtin {
builtins := make([]*ast.Builtin, 0, 15)
for n, b := range ast.BuiltinMap {
if strings.HasPrefix(n, "ec.") {
builtins = append(builtins, b)
}
}
sort.Slice(builtins, func(i, j int) bool {
return builtins[i].Name < builtins[j].Name
})
return builtins
}
func generateRegoReference(module string) error {
for _, b := range builtins {
docpath := filepath.Join(module, "pages", strings.ReplaceAll(b.Name, ".", "_")+".adoc")
f, err := os.Create(docpath)
if err != nil {
return fmt.Errorf("creating file %q: %w", docpath, err)
}
defer f.Close()
if err := regoTemplate.Execute(f, b); err != nil {
return err
}
}
return nil
}
func generateRegoReferenceNav(module string) error {
navpath := filepath.Join(module, "partials", "rego_nav.adoc")
f, err := os.Create(navpath)
if err != nil {
return fmt.Errorf("creating file %q: %w", navpath, err)
}
defer f.Close()
return regoNavTemplate.Execute(f, builtins)
}
func generateRegoBuiltins(module string) error {
builtinsPath := filepath.Join(module, "pages", "rego_builtins.adoc")
f, err := os.Create(builtinsPath)
if err != nil {
return fmt.Errorf("creating file %q: %w", builtinsPath, err)
}
defer f.Close()
return regoBuiltinsTemplate.Execute(f, builtins)
}